Measuring Energy Savings by Using Normalized Energy Intensity
For certification ISO 50001 Management System requires industries to quantify energy intensity improvement. Due to the possibility of large variation of production and weather data, the quantification of energy intensity becomes tough, hence a new method which removes these effects is required to accurately calculate the energy intensity improvement. This is a four step method which starts by developing a three parameter change point regression model using actual bills, weather and production data followed by running the model with TMY 2 weather data and historical production data. This energy consumption is called Normalized Annual Consumption (NAC). The next step involves making sliding NAC’s for sequential 12 month data (creating sequential 3 parameter change point model for 12 month data by eliminating the first month of the last model). Following generation of sliding NAC’s this consumption is to be divided by the typical production data. This paper is also shows an example case study of quantification of savings of an industry with varying production [32].